Entra (prev AAD) can be replaced by literally any other OAuth provider for SSO - shibboleth is an on-prem option.
Traditional AD is harder to replace, but OpenShift’s IdP has an AD server mode that is capable of many use-cases; the cases it doesn’t do are GPO, Windows Update forcing, and other stuff no longer relevant on linux.
Are they moving away from Exchange Server? I’d hope so, MTAs are a dime a dozen in linux land. There’s a dozen homegrown alternatives for calendar + mail, from ProtonMail to running Exim + caldav.
The rentier companies may have “extended” the open source backing, but you’re not missing much except marketing.
Traditional AD is harder to replace, but OpenShift’s IdP has an AD server mode that is capable of many use-cases; the cases it doesn’t do are GPO, Windows Update forcing, and other stuff no longer relevant on linux.
Are they moving away from Exchange Server? I’d hope so, MTAs are a dime a dozen in linux land. There’s a dozen homegrown alternatives for calendar + mail, from ProtonMail to running Exim + caldav.
The rentier companies may have “extended” the open source backing, but you’re not missing much except marketing.